Mucus and other secretory cells form a continuous lineage Airway secretory cells include both club cells, which produce SCGB1A1-laden defensive secretions and mucus secretory cells
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[12] According to WHO estimates, in Greece 63.4% of adult males and 39% of females 15 years are smokers, [13] while in young adults, aged 19-30 years, the smoking prevalence is 37.6%